See full version: How can you tell if a piston is oversized
The problem lies in the process of honing, where if a little does a good job, certainly a few more strokes to make it better looking can’t hurt anything. When I hone a block, each cylinder sees between 4 and 6 strokes, no less, no more. That will increase the bore size between . [links]
Check the bores – if one or more are damaged, scored or heavily pitted, then it will need boring. light scratches and surface rust can be dealt with by honing, without the need for a full rebore. here
Light honing [1](not a full re-bore) does not always require a new, larger piston though. Usually the engineer who re-bores the cylinder will have a specific diameter to aim for when creating the new surface and by doing so an off the shelf over-sized piston can be fitted to replace the old (smaller) piston.
‘It’s because of the higher peak piston acceleration. A long bore engine, as the name suggests, has a longer cylinder. These engines reach their peak torque at a lower rpm when compared to a short-stroke engine. These are more efficient engines and are moreover used in commercially selling cars. here
Boring out engine cylinders helps clear them of debris that can build up over years of use. Boring an engine is best left to professional mechanics, as a botched job can lead to major problems. If the bore isn’t done correctly it can result in engine knock. more
Often you could rebore two or three times. more
If your powersports engine was made in the last two decades or so, chances are it is plated with a Nikasil (nickel silicone carbide), chrome, or electrofusion plating. Nikasil has been the latest and most commonly used cylinder coating, due to its wear-resistance qualities, but they do still wear out. We recommend checking your manual for normal top-end rebuild intervals, but generally if your engine has long hours, the overall condition of your cylinder will need to be closely reviewed. This will include not only the bore size and plating condition, but also the cylinder roundness and taper in reference to OEM service specifications. There are a number of good companies that offer replating services. Just do your research and choose a trusted company. Your cylinder should come back with fresh plating, honed, and ready to go after a quick cleaning.
When your engine was made brand new in the factory, the cylinder was honed. Honing is a process of conditioning the surface of the cylinder wall to help with lubrication of the piston ring(s) during operation. Honing creates fine crosshatch imperfections on the surface of the cylinder bore. You can think of these imperfections as peaks and valleys in the surface of the metal. These are essential because it helps the cylinder wall retain oil to assist with piston ring lubrication. Theoretically, the idea is for there to be a very thin layer of oil between the edge of the piston rings and cylinder wall. If there was no oil to lubricate the constant contact with the cylinder wall, there would be too much friction and both the rings and cylinder would wear out quickly. more
A soft hone brush like this one is one of the tools that may be used to prepare the interior surface of the cylinder. Wiseco photo. more
The short answer is: probably. What does the cylinder look like?
More importantly can you see any gouges or score marks on the cylinder? That would indicate a broken ring or perhaps something warped if it ever overheated severely. If so the rule of thumb is if your fingernail catches the gouge, it needs to be bored and fitted with an oversized piston and rings. more
If the cylinder is ok, just glazed, you can use a “glaze breaker” or another small cylinder hone. Gotta make that crosshatch pattern again so the new rings can seat again. Rings actually have to wear themselves to the contour of the cylinder that’s why the crosshatch is there. If it’s smooth the rings will never “wear-in”. You gotta break it in and then change the oil. more
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